Although multiple television shows based on DC Comics or Vertigo properties premiered or continued this past season, The CW is building its own shared universe of superheroes. With Arrow entering its fourth season, The Flash going into season 2, and Legends of Tomorrow set to combine characters from both series as well as introduce new heroes, CW's DC TV universe is rapidly growing.

While Arrow and The Flash each featured origin stories for their respective heroes - Oliver Queen (Stephen Amell) and Barry Allen (Grant Gustin) - many stars of Legends of Tomorrow have already mostly gone through their transition from concerned citizen to vigilante hero. A new trailer that premiered at Comic-Con International 2015 for CW's DC universe takes a look back on Oliver and Barry's stories and sets up the Legends.

The CW released the "Hero Evolution" video (above) to coincide with the DC Entertainment: From Page to Screen panel at SDCC yesterday (The CW's DC TV universe will appear during the Warner Bros. Television & DC Entertainment panel Saturday night). A few moments into the video reveals why, as it integrates clips from Arrow, The Flash and Legends of Tomorrow with classic shots from their DC Comics source material. The mashup of printed comics, animated characters, and live-action is reminiscent of The CW's Vertigo-based series iZombie - though Liv Moore is, of course, nowhere to be seen.

“Hero Evolution” entirely recycles footage from Arrow, The Flash and the Legends of Tomorrow trailer, not giving viewers any new hint of what to expect from each series' new season. However, the video's homage to the DC comics should excite fans of both The CW’s universe and the books while showing how true to the source material they have stayed, even with imagery.

Of course, the lack of new information shouldn't come as much of a surprise since the video was released prior to Warner Bros. Television and DC Entertainment's official SDCC panel. If The CW is going to unveil anything new from Arrow, The Flash or Legends of Tomorrow, it will be at the official Warner Bros./DC panel, not the Page to Screen panel.

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That being said, it's still exciting to see the Arrow, the Flash, The Atom, Captain Cold and the rest of the Legends appear in the video alongside their comic book counterparts.

Arrow returns for season 4 Wednesday, October 7th, at 8PM on The CW; The Flash returns for season 2 Tuesday, October 6th, at 8PM on The CW; Legends of Tomorrow is expected to air on The CW in early 2016.